Process for producing paper pulp from raw stock



April 27,1926. 1,582,351

c. w. SHARTLE PROCESS FOR PRODUCING PAPER PULP FROM RAW STOCK Filed July 1-2, 1920 ATTORNEYS Patented Apr. 27, 1926.

- UNITED STATES exams w. SHARTLE, or MIDDLETOWN, OHIO.

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Application in m 12, 1920. Serial no. 395,530.

1 '0 all whom it may concern:

Be it known that I, CHARLES W. stream,

a citizen of the United States, residing at Middle-town, in the county of Butler and State of Ohio, have invented certain new and useful Improvements in Processes for Producing Paper Pulp from Raw Stock, of which the following is a specification, reference being had therein tothe accompany ng drawing. v a

This invention relates to a new and 1mproved process for producing paper pulp from raw stock, such as rags, as dist nguished from a heterogeneous stock 1n which many different kinds of materials, such as rags, paper, string, rope, metal, glass, etc., are found. v

This process comprises a series of steps or operations, by which .the raw stock is ultilnately reduced to finished pulp for making paper, as hereinafter stated.

I have selected one form of apparatus which may be employed'in practicing this goods in the broadestasense, as to convert them into a fineand complete paper pulp,

this product being'produced by the process in a succession of separate quantities, and all of the quantities belng produced simultaneously, the effect of whichis. to hasten and cheapen the cost of production. I

The process comprises an'initial breaking or reducing of the rags, whilejmmersed in water, to a coarse, though. substantially uniform state; in conveying this reduced stock,

accompanied by water, and dividing it into a succession of separate quantities; in subjecting each quantity to a beating operation in water to effect the final reduction to con: vert the stock into pulp, and in drawing oil such completed product.

It will be seen that by this process the raw stock of rags is rapidly converted into finished pulp, the pulp being gleaned in finished con it ion in a number of batches, all.

producedat the same time. The process is, therefore, not only'eflicient, but very rapid and correspondingly economical inproducing the product sought.

Turning now to the apparatus by which my process may be practiced, a breaker A of any well known type is succeeded bya series of boaters B also of acceptable known types.

The breaker comprises a vessel in which is pulley D. NVater and the broken stock flows over a weir E into a box F from which it is pumped by a stun pump G intoa distributrotatably mounted a breaker proper C having coarse knives or blades driven by a belt I). This pipe H discharges into a stockchest J for the delivery theretocf the surplus material and water which are returned to the breaker A by an overflow pipe K. Each beater comprises atub with a rotatable beater proper L having finer knives or blades than those used in the breaker proper C. A belt pulley M foreach beater proper L serves to rotate the same. A dump valve N is provided for each beater by which the beatenproduct, which is reduced to a finished state, can be drawn ofi'. The breaker also has a discharge valve 0 ior'convenience in drawing off any residuum stock.

From this outline it will be seen that the steps of my process maybe readily practiced by the apparatus illustrated in the The raw material is subjected drawings. to a. breaking operation in the breaker A and with more or-less water is fed in a broken st ate over the weir into the box and thence by the pump is forced through the delivery pipe H and discharged in quantities through the valves. I into the res ective' heaters. Here each batch is subjecte to the step of beating and reduced rapidly and continuously until it reaches a finished stage to constitute pulp, when it is discharged by openin the valve N.

y way of cross reference to my companion application filed July 12, 1920, Ser. No. 395,527, I would state that there is some similarity in the two processes. This similarity resides in the matter of the separate treatment or beating of separate quantities of stock to produce separate completed batches. But'in my process in said other application, besides these features of similarity, the pro cess is a more extended and amplified one as regards a doublebreaking operation, a settling operation, a screening operation and a thickening operation.

Havin thus fully described my invention, What I cl rim as new and desire to secure by Letters Patent, is s I 1. The herein described process of making paper pulp consisting in reducing raw stock to a partial state of reduction, in conve ing the stock so reduced through a course aving a return of excess stock to the source of first reduction, in withdrawing portions of the stock so conveyed into a series of quantities, and in reducing said quantities of ulp to finished state by. further processes 0? reduction.

2. The herein described process of makin paper pulp consisting in reducing raw stocE to a. partial state of reduction, in conveying the stock so reduced through a course having a return of excess stock to the source of first reduction, in withdrawing portions of the stock so conveyed into a series of quantities, and in reducing said'quantities of pulp to finished. state by separate simultaneous processes of reduction.

3. The herein described process of making .paper pulp consisting in reducing raw stock to a partial state of reduction, in conveying the stock so reduced through a course including a source of accumulation and return of surplus stock to the source of first reduction, in withdrawing portions of the stock so conveyed into a series of quantities, and in reducing said quantities of pulp to finished state by separate instrumentalitiesoperatedsimultaneously with said first processes of reduction.

In testimony whereof, I afiix my signature.

CHARLES W. SHARTLE. 

